I had the oil changed in my 04. 5 cummins last month at my local dodge dealer and since then have noticed oil spots on my driveway where I park. I have looked under truck numerous times and see drip of oil at center of oil filter which I have wiped off many times, but it re-occurs. Took truck to dealer today, they say filter is on tight. I now have a leak test scheduled for Thursday 12/8. Has anybody had this same problem? or know probable cause?